New motherboard and extra serial card. Both are showing +0.08 or -11.2 volts
reference chassis ground as their state voltages. The CAT port on the MP talks
to this fine, but the cord I made up with the transistor, resistor and diode
circuit I built into the db9 plug from the TR manual just barfs.
Do these need pull-ups from +12 (not on the DB9 socket anywhere) or is this a
new interface level from Y2K and beyond and need a different circuit. Com 1 &
Com 2 are on the motherboard.
Anybody run into this and solve it?
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Apex, NC, USA
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